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Considering that the reported proportion of Adenine bases in a DNA sample is 18%, Identify the true statement regarding the composition of other bases in the sample.
The percentage of Guanine bases in the sample is 32%.
The percentage of Cytosine bases in the sample is 18%.
The percentage of Thymine bases in the sample is 64%.
The percentage of purine bases in the sample is 64%.
Answers (1)
Option 1, "The percentage of Guanine bases in the sample is 32%," is the correct statement.
In DNA, Adenine (A) pairs with Thymine (T) and Guanine (G) pairs with Cytosine (C). Thus, if the proportion of Adenine bases in the sample is reported as 18%, it implies that the proportion of Thymine bases is also 18%, as they pair together.
Since the sum of the proportions of Adenine and Thymine is 36% (18% + 18%), the remaining proportion must be distributed between Guanine and cytosine. Since Guanine and Cytosine are also paired, their proportions must be equal. Therefore, each of them would be (100% - 36%) / 2 = 32%.
Hence, the correct answer is option 1.
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